1738-OW4M12 | Allen-Bradley | ArmorPoint I/O Discrete Contact Output Module

Product Overview

The Allen-Bradley 1738-OW4M12 operates as a ruggedized, on-machine discrete relay output module within the ArmorPoint I/O family. This distributed hardware component distributes control commands directly to field actuators, valves, and indicators without passing through a centralized electrical cabinet.

Featuring an IP67-rated sealed housing and standard M12 quick-disconnect hardware, this unit enables decentralized, cabinet-free architecture on automated production lines, heavy conveyor setups, and material handling systems. We supply this module exclusively as a 100% brand new, original factory-sealed unit to guarantee complete seal integrity, zero contact resistance, and immediate operational readiness.

Technical Specifications

The table below logs the precise electrical, physical, and connection parameters of the ArmorPoint output module:

Engineering Advantages

• Eliminates Costly Central Enclosures: The IP67 sealed design allows engineers to bolt this module directly onto the machine frame. This on-machine placement removes the need for long, expensive multi-conductor cable runs back to a central control cabinet, lowering infrastructure wiring costs and drastically shrinking the required footprint inside the factory floor.

• Simplifies Toolless Field Replacement: Threaded M12 quick-disconnect connectors provide secure, keyed physical interfaces for the 4 discrete channels. Field technicians swap failed actuator cables or replace modules in seconds without using wire strippers, screwdrivers, or terminal labels, minimizing error rates and slashing mean time to repair (MTTR).

• Isolates Mixed Voltage Circuits via Form A Relays: The 4 independent Form A mechanical contacts provide complete galvanic isolation between the internal logical bus and the field loads. This layout permits the module to switch diverse voltage rails (such as combining 24V DC solenoids and small AC pilot lights on the same block) without causing cross-talk or backfeeding noise into the underlying PLC network.

FAQs

• Can I use the 1738-OW4M12 module to switch high-current inductive motor loads directly?

  No. While the Form A contact design provides physical isolation, these small-form relays handle low-power pilot duties, such as driving interposing relay coils, small solenoids, and indicator beacons. Directly connecting high-current inductive motor loads causes contact-welding and premature module failure. Always verify the maximum contact amperage rating against your specific load parameters before commissioning.

• What mounting techniques ensure that the IP67 environmental seal prevents moisture ingress?

  Technicians must mount the module flat against a rigid machine surface using the integrated mounting holes. To ensure a true IP67 seal, torque all mating M12 cable connectors to the factory-specified seating limit. You must also install tightly sealed protective dust caps onto any unused M12 ports to prevent cutting fluids, washdown water, or airborne particulate matter from fouling the contact pins.

• Does this module require a separate network adapter to communicate with a ControlLogix or CompactLogix processor?

  Yes. The 1738-OW4M12 functions as a component slice within an ArmorPoint stack. You must link the module to an ArmorPoint network adapter (such as a 1738-AENTR EtherNet/IP adapter) to bridge the local backplane data across the industrial Ethernet network to your master programmable automation controller.